Malicious PDF — malware analysis report

Static analysis result for SHA-256 a7fdb271ae4794b7…

MALICIOUS

PDF

60.6 KB Created: 2020-12-13 15:17:05 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: cafbd21f85cbfc26a6d04ee6bed4508e SHA-1: 1eb0d37a26afc30530c2e284d672c40f8527f9cf SHA-256: a7fdb271ae4794b7a6e7f6cc380d2314f7d3b7115c907115d12fbe0aab292e38
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://traffset.ru/aws?utm_term=adjectives+worksheets+for+grade+4+with+answers PDF link annotation
    • https://jinunezig.weebly.com/uploads/1/3/4/3/134308797/1db9dc67d3e3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4451551/normal_5fa3cf4782730.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4427799/normal_5fa97c2c0cfc0.pdfIn PDF document text
    • https://rilemiwekeb.weebly.com/uploads/1/3/4/5/134599700/sojepuzupanu-faxufimi-xagusa.pdfIn PDF document text
    • https://dusexitope.weebly.com/uploads/1/3/4/6/134646398/960b96b0e.pdfIn PDF document text
    • https://jawasolasazilem.weebly.com/uploads/1/3/1/3/131379174/9232432.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4475375/normal_5fc4d3dc50728.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4377095/normal_5fa45ee408fe8.pdfIn PDF document text
    • https://kisebuketi.weebly.com/uploads/1/3/4/6/134657705/sanudavujoridiri.pdfIn PDF document text
    • https://jubunukaf.weebly.com/uploads/1/3/1/4/131483214/4182123.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/20427875-9a2d-40aa-b915-285ec1243327/12671083635.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000af42.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAF42 5620 bytes
SHA-256: 73a05dfab36c7c6d305e2a564b714aa958897f6e798b7a6c13c741aff2020c62
font_01_sfnt_off0000c28b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC28B 10304 bytes
SHA-256: 6e8c375e853fba9cb0b938a20c64d6a538b14b0af8204f7cb3a078c398068b3a